src/: Update the remaining include paths of string_split.h to its new location.

net/ftp/ftp_directory_listing_parser_vms_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/ftp/ftp_directory_listing_parser_unittest.h"
 
 #include "base/format_macros.h"
-#include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
+#include "base/strings/string_split.h"
 #include "base/utf_string_conversions.h"
 #include "net/ftp/ftp_directory_listing_parser_vms.h"
 
 namespace net {
 
 namespace {
 
 typedef FtpDirectoryListingParserTest FtpDirectoryListingParserVmsTest;
 
 TEST_F(FtpDirectoryListingParserVmsTest, Good) {
@@ skipping 137 matching lines @@
       std::vector<FtpDirectoryListingEntry> entries;
       EXPECT_FALSE(ParseFtpDirectoryListingVms(lines,
                                                &entries));
     }
   }
 }
 
 }  // namespace
 
 }  // namespace net